Doob-lock



Umain s Ars gianni* muon.

GEORGE OATES, OF CHARLESTON, SOUTH CAROLINA.

DOOR-LOCK.

Specification of Letters Patent No. 4,175, dated September 2,1845.

To all whom i may concern Be it known that I, GEORGE OATns, of the city of Charleston and State of South Carolina, have invented a new and useful D001 Lock; and I do hereby declare that the following is a full, clear, and exact description of the construct-ion and operation of the same, reference being had to the annexed drawings, making part of this specification.

The nature of my invention consists in putting two bolts, both to be locked by the same key, into one lock, one of which (see letter A) is to be locked and unlocked from the outside, and the other (see letter B) is to be locked and unlocked from theV inside-neither of the key holes to pass through the lock. Between the two bolts,

I have placed a dog (see letter C) which turning on a pivot F, when either of the bolts is locked, acts as a bolt to the bolt that is not looked, so that if the inside bolt be looked, the outside bolt cannot be moved,

even though a duplicate key should be used for the purpose, and if the out-side bolt be locked, the result is the same, the inside bolt cannot be moved, being bolted by the dog.

The bolt of the outer lock (see lett-er D) being between the outer key hole, and the inner bolt (see letter E) when the latter is locked, it is impossible that it should be picked from the outside,-the only way in which admission could be obtained, would be by breaking open the door.

Vhat I'claim as my invention, and desire to secure by Letters Patent, is-

Combining the two bolts by means of the dog or lever C, so that when the inside bolt has been locked, the outside one cannot be locked as described.

eno. oATEs.

Witnesses:

H. Y. GRAY, MORRIS GOLDSMITH. 

